pH调控水热法合成BiVO_(4)及其可见光催化降解甲基橙

以硝酸铋为铋源,偏钒酸铵为钒源,醋酸钠调节pH值,采用水热法合成光催化剂BiVO_(4),采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对产物进行结构和形貌分析.在可见光条件下,考察BiVO_(4)对甲基橙(MO)的光催化性能.结果表明,在pH值为6.0的条件下合成的BiVO_(4)具有较优的光催化性能,可见光条件下催化反应5 h后,MO的降解率达到98.4%,并且在循环反应5次后对MO的降解率仍在95%以上.因BiVO_(4)良好的光催化活性和稳定性,在废水处理领域有非常广阔的应用前景.

Synthesis of BiVO4 by pH-Controlled Hydrothermal Method and Visible-Light Catalytic Degradation of Methyl Orange

Bismuth vanadate (BiVO₄) was synthesized by a hydrothermal method with bismuth nitrate as the Bi source and ammonium metavanadate as the V source, and sodium acetate (NaAc) was used to adjust the pH. The structure and morphology of the product were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic performance of BiVO₄ on methyl orange (MO) was investigated under visible-light. The results showed that BiVO₄, synthesized at a pH value of 6.0, had a better photocatalytic performance. The degradation rate of MO reached 98.4% after 5 h, and the degradation rate of MO still maintained at over 95% after five cycles. Due to the excellent photocatalytic activity and stability of BiVO₄, BiVO₄ has a potential application in wastewater treatment.